knife edge

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knife edge

PostPosted: Sun Dec 30, 2018 9:28 pm

Hello,
What's your preferred .46 glow engine profile for knife edge ?
Thanks
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Re: knife edge

PostPosted: Sun Dec 30, 2018 9:51 pm

Depends if your knife edging a brick or a 2x4?
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Re: knife edge

PostPosted: Sun Dec 30, 2018 10:07 pm

Upright or inverted knife edge? :dk:
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Re: knife edge

PostPosted: Sun Dec 30, 2018 10:53 pm

Have not flown the sbach 45 from triflyer but if its anything like the 25 35 and 65 sizes it should be absolutely rock steady in knife edge.
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Re: knife edge

PostPosted: Sun Dec 30, 2018 11:02 pm

I had to read that again to see what he meant.


Any slab knife edges great for the most part just due to the slab design.

Wild Fred did design one that barely knife edge but it's nOt commercially available :)
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Re: knife edge

PostPosted: Sun Dec 30, 2018 11:35 pm

My original kit version Chinn Yakk was super rock solid in KE. Although I dearly love the tube, I think the fully sheeted plank design of the original Chinn added a bit of rigidity that the tube doesn't.
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Re: knife edge

PostPosted: Mon Dec 31, 2018 12:10 am

Doug B wrote:My original kit version Chinn Yakk was super rock solid in KE. Although I dearly love the tube, I think the fully sheeted plank design of the original Chinn added a bit of rigidity that the tube doesn't.


Really? I must be doing something wrong or they changed something in the arf because mine is about the worst profile I own in a KE
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Re: knife edge

PostPosted: Mon Dec 31, 2018 12:11 am

gomer wrote:Have not flown the sbach 45 from triflyer but if its anything like the 25 35 and 65 sizes it should be absolutely rock steady in knife edge.


:gp:

As you know, all Ron's designs fly amazing. The Sbach 45 is good, I have 2 and they fly great. I have a Stix 46 and that is amazing too! If I was going through the effort of scratching one from plans, I would do a Stix 46 Lam.

I suck at KE, but for some reason the GBR 50 is the best KE plane I've ever owned... I was doing horizon to horizon KE passes like a pro. Then I did some amazing KE elevators and had to pinch myself to see if I really just did that :D :D
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Re: knife edge

PostPosted: Mon Dec 31, 2018 12:25 am

gomer wrote:
Doug B wrote:My original kit version Chinn Yakk was super rock solid in KE. Although I dearly love the tube, I think the fully sheeted plank design of the original Chinn added a bit of rigidity that the tube doesn't.


Really? I must be doing something wrong or they changed something in the arf because mine is about the worst profile I own in a KE


The ARF was built a lot differently. I think it had two carbon tubes. Jeremy "approved" the ARF version, but I never thought it was as good as the original kit version. Mine had a Saito 82 in the nose. I could throw it into knife edge, and then rotate another 5 degrees toward the canopy, and it would lock in rock solid. The secret I found was to rotate to about 5 degrees from actual KE. And mine was setup fairly tail heavy. I would hold rudder and then add or remove power to climb or sink. It was awesome. I still have one original Chinn Yakk Kit from the original kit run of 30 planes. Maybe someday I'll build it....
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Re: knife edge

PostPosted: Mon Dec 31, 2018 7:26 am

Doug B wrote:My original kit version Chinn Yakk was super rock solid in KE. Although I dearly love the tube, I think the fully sheeted plank design of the original Chinn added a bit of rigidity that the tube doesn't.
And this is why ive always disliked tube planes. they are built different when they have a tube and no sheeting makes them more flimsy.
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Re: knife edge

PostPosted: Mon Dec 31, 2018 10:21 am

There is more that just the airplane that has an effect in knife edge. The balance will have an effect, but one of the biggest is the propeller choice. 10 years ago I tested several different propellers on one airframe engine combo. With some the airplane flew knife edge rock solid, but with others it was a handful.
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Re: knife edge

PostPosted: Mon Dec 31, 2018 10:46 am

3Dreaming wrote:There is more that just the airplane that has an effect in knife edge. The balance will have an effect, but one of the biggest is the propeller choice. 10 years ago I tested several different propellers on one airframe engine combo. With some the airplane flew knife edge rock solid, but with others it was a handful.


Now that you mention it, my chinn yak is the only plane I have on the 6s setup which makes me run a smaller prop. It doesn't suit my flying style in any aspect. I have been blaming it on the airframe, but maybe it is the power system that makes it act stupid.
tcipolla wrote:If it flies, floats, or fu#*s, rent it.


Zamfir wrote: More power, more stiffness..like viagra for yer soul!
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Re: knife edge

PostPosted: Mon Dec 31, 2018 1:10 pm

3Dreaming wrote:There is more that just the airplane that has an effect in knife edge. The balance will have an effect, but one of the biggest is the propeller choice. 10 years ago I tested several different propellers on one airframe engine combo. With some the airplane flew knife edge rock solid, but with others it was a handful.

Another thing I learned a long time ago is you don't want the plane to be tail heavy at all in knife edge it makes it back to the canopy and gear like crazy.
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Re: knife edge

PostPosted: Mon Dec 31, 2018 9:38 pm

gomer wrote:
Now that you mention it, my chinn yak is the only plane I have on the 6s setup which makes me run a smaller prop. It doesn't suit my flying style in any aspect. I have been blaming it on the airframe, but maybe it is the power system that makes it act stupid.


What system and what prop? We've found that with 6S you can run bigger props easily.. TriFlyer, Cartman, Steener and myself did a lot of testing at Ottumwa 2 years ago and we found that 14X6 14X7 was a breeze and that they could actually handle a 15X6 - BUT most people don't like to run that big a props on a 40 size...
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Re: knife edge

PostPosted: Mon Dec 31, 2018 11:38 pm

I am running a 14x6 on the 560kv cobra on 6s and 15x6 on the 830kv tomcat 4s. I was told from the guy I bought the plane that the motor was already pushing the amp limit and got kinda hot with the 14x6 and that 15x6 would be way too much. I personally like the way bigger prop on 4s performs.
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Re: knife edge

PostPosted: Tue Jan 01, 2019 2:09 pm

i hear a u-can-do knife edges awesome...
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Re: knife edge

PostPosted: Tue Jan 01, 2019 3:04 pm

Wild Fred wrote:i hear a u-can-do knife edges awesome...


But only when it has SFG's installed. :mrgreen:
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Re: knife edge

PostPosted: Tue Jan 01, 2019 11:03 pm

gomer wrote:I am running a 14x6 on the 560kv cobra on 6s and 15x6 on the 830kv tomcat 4s. I was told from the guy I bought the plane that the motor was already pushing the amp limit and got kinda hot with the 14x6 and that 15x6 would be way too much. I personally like the way bigger prop on 4s performs.


Good, the 14X6 should be spot on for the 560KV..
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Re: knife edge

PostPosted: Wed Jan 02, 2019 11:08 am

Speaking of knife edge....if the plane pulls toward the gear, is it nose or tail heavy?
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Re: knife edge

PostPosted: Wed Jan 02, 2019 11:40 am

tcipolla wrote:Speaking of knife edge....if the plane pulls toward the gear, is it nose or tail heavy?

I believe all pitching both ways is due to tail heaviness.
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